Base for a ski exerciser



FIG. 1 is a perspective view of a base for a ski exerciser showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof, the side opposite being substantially identical; and,

FIG. 4 is a left side elevational view thereof, the side opposite being substantially identical.

The broken lines shown in FIG. 1 represent environment only and form no part of the claimed design. 

The ornamental design for a base for a ski exerciser, as shown and described. 